Best friends forever... It's the Sweet Valley Middle School sixth-grade trip to a fabulous amusement park! Both twins, Elizabeth and Jessica Wakefield, have been waiting for this day for ages. And now that it's here, they're not even talking to each other! Despite their argument, Elizabeth can't stay angry for long. But when she goes to apologize to Jessica, she is nowhere to be found. As Elizabeth searches for her lost sister, she's caught up in a series of exciting and dangerous adventures as incredible as Alice's trip through Wonderland--adventures that lead the Wakefield twins to discover what real friendship--and sisterhood--is all about.